Correction for defective memory of a memory-in-pixel display

ABSTRACT

An electronic display may include a pixel circuit. The pixel circuit may include memory storage to store data values representative of image data to be depicted via the pixel circuit. The memory storage may also include memory components for storing bits of the data value. The pixel circuit may also include a light-emitting device for emitting light based at least in part on the data value and a controller. The controller may receive the data value and store the bits based on a mapping between the bits and the memory components. The mapping may be determined based on routing one or more of the bits associated with one or more defective memory components of the memory components to one or more other memory components of the memory components. The controller may also drive the light-emitting device to emit light based on the bits stored in accordance with the mapping.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.62/732,321, entitled “Correction Techniques for Defective Memory of aMemory-in-Pixel Display,” filed on Sep. 17, 2018, which is incorporatedherein by reference in its entirety for all purposes.

SUMMARY

A summary of certain embodiments disclosed herein is set forth below. Itshould be understood that these aspects are presented merely to providethe reader with a brief summary of these certain embodiments and thatthese aspects are not intended to limit the scope of this disclosure.Indeed, this disclosure may encompass a variety of aspects that may notbe set forth below.

Methods and systems for reducing visual artifacts caused by defectivememory circuitry of a memory-in-pixel electronic display may provideimmense value. The techniques described herein may provide for variousrerouting schemes to adjust how image data is stored in the memory ofthe memory-in-pixel electronic display before being used to drive apixel to emit light. That is, image data may initially be stored as datavalues in memory-in-pixels prior to being used to drive the respectivepixels. With this in mind, in response to a memory component of amemory-in-pixel being inaccessible (e.g., defective), other memorycircuitry may be used to reduce the effects of the defective memorycomponent. For example, the memory component corresponding to thedefective memory circuitry may be replaced by another memory component,such as a back-up memory component of the memory-in-pixel, and the imagedata may be rerouted to the respective pixel via the replacement memorycomponent.

In some cases, pixel data may be stored in memory components asrespective bits of data. In this way, one bit may be stored per memorycomponent. Since each memory component stores one bit, when any of thememory components are defective, the replacement memory component mayact as substitute bit storage for the defective memory component withoutobservable loss of performance. For example, the memory component forthe least significant bit of a pixel may be mapped to the defectivememory component to replace the defective memory component, and thusreduce the effects of the defective memory component. In otherembodiments, a spare memory component may be used to replace a defectivememory component, thereby reducing the appearance of visual artifactsdue to the inability of the pixel to display image data via thedefective memory component.

As such, this disclosure describes an electronic display having one ormore pixels that include memory, or a memory-in-pixel electronicdisplay, and techniques for rerouting image data for the one or morepixels based on defective memory of the electronic display. Theinclusion of the rerouting may enable usage of the memory-in-pixelelectronic display even while defective memory remains within thememory-in-pixel electronic display. In this way, the rerouting mayreduce or eliminate visual artifacts caused by defective memory of thememory-in-pixel electronic display.

BRIEF DESCRIPTION OF THE DRAWINGS

Various aspects of this disclosure may be better understood upon readingthe following detailed description and upon reference to the drawings inwhich:

FIG. 1 is a schematic block diagram of an electronic device, inaccordance with an embodiment;

FIG. 2 is a perspective view of a fitness band representing anembodiment of the electronic device of FIG. 1, in accordance with anembodiment;

FIG. 3 is a front view of a slate representing an embodiment of theelectronic device of FIG. 1, in accordance with an embodiment;

FIG. 4 is a front view of a notebook computer representing an embodimentof the electronic device of FIG. 1, in accordance with an embodiment;

FIG. 5 is a block diagram of a display system of the electronic deviceof FIG. 1, in accordance with an embodiment;

FIG. 6 is a block diagram of an embodiment of a pixel of the displaysystem FIG. 5 that emits light according to a pulse width emissionscheme, in accordance with an embodiment;

FIG. 7 is a circuit diagram of an example memory circuitry of FIG. 6, inaccordance with an embodiment;

FIG. 8A is a diagrammatic representation of the memory circuitry of FIG.6 including a spare bit-store, in accordance with an embodiment;

FIG. 8B is a diagrammatic representation of the memory circuitry of FIG.6 having a defective bit-store, in accordance with an embodiment;

FIG. 8C is a diagrammatic representation of the memory circuitry of FIG.6 implementing rerouting techniques to reroute data from the defectivebit-store to the spare bit-store, in accordance with an embodiment;

FIG. 9 is a block diagram of the diagrammatic representation of FIG. 8Cassociated with the first embodiment of the memory circuitry of FIG. 6,in accordance with an embodiment;

FIG. 10A is another diagrammatic representation of the memory circuitryof FIG. 6, in accordance with an embodiment;

FIG. 10B is a diagrammatic representation of the memory circuitry ofFIG. 6 having a defective bit-store, in accordance with an embodiment;

FIG. 10C is a diagrammatic representation of the memory circuitry ofFIG. 6 implementing rerouting techniques to reroute data from thedefective bit-store to an existing least significant bit, in accordancewith an embodiment;

FIG. 11 is a block diagram of the diagrammatic representation of FIG.10C associated with the memory circuitry of FIG. 6, in accordance withan embodiment;

FIG. 12A is a third diagrammatic representation of the memory circuitryof FIG. 6 including the spare bit-store, in accordance with anembodiment;

FIG. 12B is a diagrammatic representation of the memory circuitry ofFIG. 6 having a first defective bit-store and a second defectivebit-store, in accordance with an embodiment;

FIG. 12C is a diagrammatic representation of the memory circuitry ofFIG. 6 implementing rerouting techniques to reroute data for the firstdefective bit-store to the spare bit-store and to reroute data for thesecond defective bit-store to the bit-store corresponding to a leastsignificant bit, in accordance with an embodiment;

FIG. 13 is a flow chart for a method for generating a map of defectivebit-stores for a memory-in-pixel electronic display, in accordance withan embodiment; and

FIG. 14 is a flow chart for a method displaying an image via thememory-in-pixel electronic display according to the map of defectivebit-stores, in accordance with an embodiment.

DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS

One or more specific embodiments will be described below. In an effortto provide a concise description of these embodiments, not all featuresof an actual implementation are described in the specification. Itshould be appreciated that in the development of any such actualimplementation, as in any engineering or design project, numerousimplementation-specific decisions are made to achieve the developers'specific goals, such as compliance with system-related andbusiness-related constraints, which may vary from one implementation toanother. Moreover, it should be appreciated that such a developmenteffort might be complex and time consuming, but would nevertheless be aroutine undertaking of design, fabrication, and manufacture for those ofordinary skill having the benefit of this disclosure.

When introducing elements of various embodiments of the presentdisclosure, the articles “a,” “an,” and “the” are intended to mean thatthere are one or more of the elements. The terms “comprising,”“including,” and “having” are intended to be inclusive and mean thatthere may be additional elements other than the listed elements.Additionally, it should be understood that references to “oneembodiment” or “an embodiment” of the present disclosure are notintended to be interpreted as excluding the existence of additionalembodiments that also incorporate the recited features.

The present disclosure relates generally to techniques for implementingmemory in pixels of an electronic display and, more specifically,correction techniques for defective memory circuitry. Electronicdisplays are found in numerous electronic devices, from mobile phones tocomputers, televisions, automobile dashboards, and many more. Electronicdisplays have achieved increasingly higher resolutions by reducingindividual pixel size, but these increasing resolutions may increase abandwidth used to communicate image data from the processing circuitryto a pixel array for presentation of the image, since more image data isused to communicate the same image at a higher electronic displayresolution.

To correct for this, memory may be included in electronic display, suchas in pixels of the electronic display, and may enable the electronicdisplay to reduce its reliance on a frame buffer to store image data tobe depicted via the pixels. Having memory in the pixels may lessen thedesign complexity of electronic displays, as well, because the lessimage data that is concurrently transmitted to a pixel array of anelectronic display, the simpler an electronic display may be designed.However, the use of memory-in-pixels may increase the risk ofperceivable visual artifacts due to the memory components of certainpixels becoming defective, corrupted, or inaccessible. Thus, embodimentsof the present disclosure relate to correction techniques for minimizingthe impact of defective memory circuitry of a memory-in-pixel electronicdisplay.

A memory-in-pixel electronic display may include multiple pixels andmultiple memory circuits to temporarily store image data before usingthe image data to drive the pixels. Including memory in the pixels mayreduce transmission bandwidths of image data to pixel arrays for displaybecause the pixel may store image data in the respective memory. In thisway, a reliance on frame buffers to temporarily store the image dataexternal to the pixel is reduced because the pixel has its own memory tostore its own image data prior to display of the image data.

Memory may be implemented in pixel circuitry that includes alight-emitting diode (LED). An organic light-emitting diode (OLED)represents one type of light-emitting device that may be found in thepixel, but other types of LEDs or other light-emitting or modulatingcomponents may be used in the pixel circuitry as a light-emittingdevice, such as components to support liquid crystal displays (LCDs),plasma display panels, dot-matrix displays, or the like.

A general description of suitable electronic devices that may include amemory-in-pixel electronic display that uses rerouting techniques towork around any defective memory circuitry and that displays imagesthrough emission of light from light-emitting components, such as a LED(e.g., an OLED) display, or through emission of light fromlight-modulating components, such as liquid-crystal on silicon (LCOS)devices or digital micro-mirror (DMD) devices, and correspondingcircuitry are provided in this disclosure. It should be understood thata variety of electronic devices, electronic displays, and electronicdisplay technologies may be used to implement the techniques describedhere. One example of a suitable electronic device is shown in FIG. 1(e.g., electronic device 10) and may include, among other things,processor(s) such as a processing core complex 12, storage device(s) 14,communication interface(s) 16, an electronic display 18, inputstructures 20, and a power supply 22. The blocks shown in FIG. 1 mayeach represent hardware, software, or a combination of both hardware andsoftware. The electronic device 10 may include more or fewer elements.It should be appreciated that FIG. 1 merely provides one example of aparticular implementation of the electronic device 10.

The processing core complex 12 of the electronic device 10 may performvarious data processing operations, including generating and processingimage data for display on the electronic display 18, in combination withthe storage device(s) 14. For example, instructions that are executed bythe processing core complex 12 may be stored on the storage device(s)14. The storage device(s) 14 may include volatile memory, non-volatilememory, or a combination thereof. By way of example, the storagedevice(s) 14 may include random-access memory, read-only memory, flashmemory, a hard drive, and so forth.

The electronic device 10 may use the communication interface(s) 16 tocommunicate with various other electronic devices or elements. Thecommunication interface(s) 16 may include input/output (I/O) interfacesand/or network interfaces. Such network interfaces may include those fora personal area network (PAN) such as Bluetooth, a local area network(LAN) or wireless local area network (WLAN) such as Wi-Fi, and/or for awide area network (WAN), such as a cellular network.

Using pixels containing light-emitting components (e.g., LEDs, OLEDs),the electronic display 18 may show images generated by the processingcore complex 12. The electronic display 18 may include touchscreenfunctionality for users to interact with a user interface appearing onthe electronic display 18. Input structures 20 may also enable a user tointeract with the electronic device 10. In some examples, the inputstructures 20 may represent hardware buttons, which may include volumebuttons or a hardware keypad. The power supply 22 may include anysuitable source of power for the electronic device 10. This may includea battery within the electronic device 10 and/or a power conversiondevice to accept alternating current (AC) power from a power outlet.

As may be appreciated, the electronic device 10 may take a number ofdifferent forms. As shown in FIG. 2, the electronic device 10 may takethe form of a watch 30. For illustrative purposes, the watch 30 may beany Apple Watch® model available from Apple Inc. The watch 30 mayinclude an enclosure 32 that houses the electronic device 10 elements ofthe watch 30. A strap 34 may enable the watch 30 to be worn on the armor wrist. The electronic display 18 may display information related tothe watch 30 operation, such as the time. Input structures 20 may enablea person wearing the watch 30 to navigate a graphical user interface(GUI) on the electronic display 18.

The electronic device 10 may also take the form of a tablet device 40,as is shown in FIG. 3. For illustrative purposes, the tablet device 40may be any iPad® model available from Apple Inc. Depending on the sizeof the tablet device 40, the tablet device 40 may serve as a handhelddevice such as a mobile phone. The tablet device 40 includes anenclosure 42 through which input structures 20 may protrude. In certainexamples, the input structures 20 may include a hardware keypad (notshown). The enclosure 42 also holds the electronic display 18. The inputstructures 20 may enable a user to interact with a GUI of the tabletdevice 40. For example, the input structures 20 may enable a user totype Short Message Service (SMS) text messages, Rich CommunicationsService (RCS) text messages, or make a telephone call. A speaker 44 mayoutput a received audio signal and a microphone 46 may capture the voiceof the user. The tablet device 40 may also include a communicationinterface 16 to enable the tablet device 40 to connect via a wiredconnection to another electronic device.

A computer 48 represents another form that the electronic device 10 maytake. For illustrative purposes, the tablet device 40 may be anyMacBook® model available from Apple Inc. It should be appreciated thatthe electronic device 10 may also take the form of any other computer,including a desktop computer. The computer 48 shown in FIG. 4 includesthe electronic display 18 and input structures 20 that include akeyboard and a track pad. Communication interfaces 16 of the computer 48may include, for example, a universal service bus (USB) connection.

In any case, as described above, operating an electronic device 10 tocommunicate information by displaying images on its electronic display18 generally consumes electrical power. Additionally, as describedabove, electronic devices 10 often store a finite amount of electricalenergy. Thus, to facilitate improving power consumption efficiency, anelectronic device 10, in some embodiments, may include an electronicdisplay 18 that implements memory-in-pixel as a way to reduce, oreliminate, use of an external frame buffer in displaying images, andthus reducing power consumed by use of the frame buffer in displayingimages and/or reducing a bandwidth of image data being received into theelectronic display 18. In some cases, an internal frame buffer (e.g.,located in the electronic display 18, such as in a display driverintegrated circuit of the electronic display 18) may be used in lieu ofor in addition to memory-in-pixel techniques. By implementingmemory-in-pixel or related techniques, an electronic display 18 may beprogrammed with smaller bandwidths of image data, further enabling powerconsumption savings. In addition, an electronic display 18 using memoryin the pixel or in an onboard frame buffer may have a less complexdesign than an electronic display 18 without memory in the pixel orwithout an onboard frame buffer. These benefits may be realized becausea pixel retains data transmitted to its memory until new image data iswritten to the memory.

Similarly, portions of image data may program a subset of pixelsassociated with the electronic display 18. An image to be displayed istypically converted into numerical data, or image data, so that theimage is interpretable by components of the electronic display 18. Inthis way, image data itself may be divided into small “pixel” portions,each of which may correspond to a pixel portion of the electronicdisplay 18, or of a display panel corresponding to the electronicdisplay 18. In some embodiments, image data is represented throughcombinations of red-green-blue light such that one pixel appearing tohave a single color is really three sub-pixels respectively emitting aproportion of red, green, and blue light to create the single color. Inthis way, numerical values, or image data, that quantify thecombinations of red-green-blue light may correspond to a digitalluminance level, or a gray level, that associates a luminance intensity(e.g., a brightness) of a color of the image data for those particularsub-pixels.

As will be appreciated, the number of gray levels in an image usuallydepends on a number of bits used to represent the gray levels in aparticular electronic display 18, which may be expressed as 2^(N) graylevels where N corresponds to the number of bits used to represent thegray levels. By way of example, in an embodiment where an electronicdisplay 18 uses 8 bits to represent gray levels, the gray level rangesfrom 0, for black or no light, to 255, for maximum light and/or fulllight, for a total of 256 potential gray levels. Similarly, anelectronic display 18 using 6 bits may use 64 gray levels to represent aluminance intensity for each sub-pixel.

Having memory in the pixels of an electronic display 18 enables imagedata to transmit to sub-pixels associated with one color without imagedata having to transmit to additional sub-pixels associated with asecond color at the same time. For the purposes of this disclosure,sub-pixels are discussed in terms of red-green-blue color channels,where a color channel is a layer of image data including gray levels fora single color where, when combined with additional color channels,creates an image of a true, or desired, color, and where the image datafor a color channel corresponds to image data transmitted to a sub-pixelfor the color channel. However, it should be understood that anycombination of color channels and/or sub-pixels may be used, such as,blue-green-red, cyan-magenta-yellow, and/or cyan-magenta-yellow-black.

FIG. 5 is a block diagram of a display system 50 associated with anelectronic display 18 that does not implement memory-in-pixel and adisplay system 52 associated with an electronic display 18 that doesimplement memory-in-pixel, which may each respectively be implemented inan electronic device 10. The display system 50 includes a timingcontroller 54 to receive image data 56, a frame buffer 58, a row driver60 and a column driver 62 communicatively coupled through communicativelink 64 to the timing controller 54, and a pixel array 66 that receivescontrol signals from the column driver 62 and the row driver 60 tocreate an image on an electronic display 18. Furthermore, the displaysystem 52 includes a timing controller 54 to receive the image data 56,a row driver 60 and a column driver 62 communicatively coupled through acommunicative link 68 to the timing controller 54, and a pixel array 69implementing memory-in-pixel techniques that receives control signalsfrom the column driver 62 and the row driver 60 to create an image on anelectronic display 18.

In preparing to display an image, the display system 50 may receive theimage data 56 at the timing controller 54. The timing controller 54 mayreceive and use the image data 56 to determine clock signals and controlsignals to control a provision of the image data 56 to the pixel array66 through the column driver 62 and the row driver 60. Additionally oralternatively, in some embodiments, the image data 56 is received by theframe buffer 58.

In either case, the frame buffer 58 may serve as external storage forthe timing controller 54 to store the image data 56 prior to output tothe column driver 62 and/or the row driver 60. The timing controller 54may transmit the image data 56 from the frame buffer 58 to the columndriver 62 and/or the row driver 60 through the communicative link 64.

In some embodiments, the communicative link 64 is large enough (e.g.,determined through transmission bandwidth of image data) tosimultaneously transmit image data 56 associated with all the channelsto the row driver 60 and/or the column driver 62, for example, the imagedata 56 associated with a red channel, a green channel, and a bluechannel. In this way, the communicative link 64 communicates the imagedata 56 associated with a respective pixel of the pixel array 66 for thered channel, the green channel, and the blue channel. The column driver62 and the row driver 60 may transmit control signals based on the imagedata 56 to the pixel array 66. In response to the control signals, thepixel array 66 emits light at varying luminosities or brightness levels,as indicated through gray levels (e.g., 0 to 255) to communicate animage.

The display system 52 receives the image data 56 at the timingcontroller 54. The timing controller 54 may use the image data 56 todetermine clock signals used to provision the image data 56 to thememory-in-pixel pixel array 69. The timing controller 54 transmits theimage data 56 to the row driver 60 and/or the column driver 62 toprogram the memory of the pixel array 69 with digital data signalsassociated with the image data 56, where the digital data signalsindicate the emission brightness/gray level for the pixels of the pixelarray 69.

By implementing memory-in-pixel systems and methods, power consumptionof the electronic device 10 may decrease because memory-in-pixeltechniques may enable storing and retrieving of data in the frame buffer58 to be bypassed. In some embodiments, power consumption may be furtherreduced because memory-in-pixel circuitry may retain data that does notchange between presented images, thus reducing an overall number ofpixel data loading cycles. FIG. 6 is a block diagram of an example of asub-pixel 72 including a memory 78, a driver 80, a current source 102, aLED 103, a switch 104 (e.g., switching circuitry), and a comparator 132(e.g., comparing circuitry) and a counter 130 (e.g., countingcircuitry). The driver 80 may include the current source 102 and theswitch 104. The sub-pixel 72 receives a variety of signals includingimage data 98, a gray level clock 134, a common voltage 110, a firstreference voltage 112, a second reference voltage 114, and a data clock116 from circuitry external to the sub-pixel 72. It should beappreciated that the depicted sub-pixel 72 is merely intended to beillustrative and not limiting. For example, the memory 78 is describedherein as an 8-bit register, but it should be understood that anysuitable memory circuit may be used to store any suitable number ofbits. It should also be understood that components such as the switch104, the counter 130, and/or the comparator 132 may take a variety ofsuitable forms that provide a similar or same function described herein.In some embodiments, the timing controller 54 or other suitablecontroller circuitry that performs the methods described herein may bepart of the sub-pixel 72.

The depicted sub-pixel 72 may emit according to a pulse width emissionscheme. Image data 98 transmits to the memory 78, for example, from acolumn driver 62, for storage. Additionally or alternatively, image data98, image data 56, or any suitable image data may be transmitted to thememory 78 for storage. In some embodiments, the image data 98 may beclocked into the memory 78 by the data clock 116, for example, on arising edge of the data clock 116. The image data 98 communicated to thesub-pixel 72 may correspond to a desired gray level at which therespective sub-pixel 72 is to emit light.

Using the image data 98 stored in the memory 78, the comparator 132determines if a current number represented by a sequence of bitsgenerated by the counter 130 is less than or equal to the image data 98in memory 78. In other words, the counter 130 counts up to the numberindicated by the image data 98 (e.g., numerical gray level) and, inresponse to the number represented by the counter 130 meeting acondition (e.g., smaller than or equal to the number indicated by theimage data 98), the comparator 132 outputs a control signal (MTCH) toclose the switch 104. When the condition is not met, the comparator 132does not output a control signal and opens the switch 104. Additionallyor alternatively, the comparator 132 may enable a deactivation controlsignal to cause the opening of the switch 104. For instance, if thememory 78 stores a binary sequence of 10110101 corresponding to thenumber 181, the comparator 132 may check if the counter 130 has countedto the number 181, and when the counter 130 exceeds the number 181, thecomparator 132 transmits a control signal (MTCH) to open the switch 104thus preventing the LED 103 from emitting light.

When the switch 104 closes, an electrical connection is created betweenthe common voltage 110 and the first reference voltage 112. This causescurrent from current source 102 to transmit through the LED 103 causinglight to emit from the sub-pixel 72. Thus, emission periods of thesub-pixel 72 may be varied to control a perceived light emitted from thesub-pixel 72 through changing a number indicated by the image data 98.Additionally or alternatively, in some embodiments, the second referencevoltage 114 is included to alter an overall current value used tocontrol light emitted from the LED 103. For instance, the secondreference voltage 114 may increase a sensitivity of the LED 103 tocurrent changes, such that a lower current value may be used to causelight to emit from the LED 103.

The counter 130 counts from a minimum value to a maximum value, andincrements through the range based on a gray level clock 134. Periods ofthe gray level clock 134 thus may cause the time difference betweenincrements of the gray level. The sub-pixel 72 may follow a pulse widthemission scheme. A representation of an emission of light from asub-pixel 72 following a pulse width emission scheme is shown in graph136. The graph 136 includes an actual emission period 138 and a totalemission period 140, where the duration of the actual emission period138 may be based on the value of the image data 98 from the counter 130.The total emission period 140 corresponds to a total length of emissionand thus a maximum brightness of light that may emit from the sub-pixel72. The comparator 132 permits light emission for the duration of theactual emission period 138 and in this way, a sub-pixel 72 may emitlight of varying perceived brightness.

As described in FIG. 6, using memory-in-pixel techniques and acomparator may enable a row driver to create a pulse width emissionscheme. FIG. 7 is a block diagram of a portion 168 an embodiment of asub-pixel 72 including a comparator 170, memory circuitry 172, andmemory circuitry 174. It should be appreciated that the sub-pixel 72 isintended to be illustrative and not limiting. For example, while thememory circuitry 174 is shown as being coupled to LED driver circuitryand to light-emitting circuitry of the sub-pixel 72, the memorycircuitry 174 may couple to any suitable light-emitting circuitry and/ordriving circuitry.

In the depicted sub-pixel 72, image data (data) of size N bits (e.g.,image data 98) is received into the memory circuitry 172 following asimilar process as described earlier. That is, a row driver 60 operatesto enable a respective control signal (write_en) to activate arespective transistor 176 to transmit the image data into the bit-stores178. As depicted, the bit-stores 178 are inverter pairs that are used ina memory cell (e.g., a static random access memory (SRAM) cell) forlatching a transmitted voltage value indicative of a bit value (where agroup of these bits represents a gray level) until a next voltage valueis transmitted for latching (e.g., storage). However, it should beunderstood that a variety of components may be used to store a voltageindicative of a bit.

In some embodiments, the row driver 60 operates in tandem with a columndriver 62 to cause parallel transmission of all bits associated with theimage data into the bit-stores 178 by simultaneously activating one ormore of the transistors 176. Additionally or alternatively, the rowdriver 60 may cause bitwise transmission of the image data throughselectively activating each transistor 176, for example, loading a bitinto bit-store 178A by selectively activating the transistor 176A tocause transmission of the least significant bit of the image data.

After the bits of the gray level corresponding to the image data arestored in the bit-stores 178, the comparator 170 compares the storedbits with bits transmitted from a counter 130. As a reminder, in thepulse width emission scheme, the counter 130, increments up to a maximumgray level, such as on the rising edge of a gray level clock 134, andlight emission occurs from the sub-pixel 72 until the counter 130 countsup to a number (e.g., represented by bits outputted from the counter130) equaling and/or exceeding a number represented by the stored bit ofthe image data. The comparator 170 may thus perform a compression of allof the received bits into a single bit indicative of whether the storedgray level equals the count transmitted from the counter 130. In thisway, the comparator 170 performs a bitwise XNOR compression to a singlebit, where an output from the comparator 170 is a logical low (e.g.,“0”) value unless every bit matches. If every bit matches, thecomparator 170 outputs a logical high value. The output from thecomparator 170 is stored in memory circuitry 174, where the value isretained in a bit-store 180 until the row driver 60 causes the output ofthe comparator 170 to transmit to the driver and light-emittingcircuitry (e.g., LED, OLED) to drive light emission as previouslydescribed. The row driver 60 may activate two transistors with controlsignals (emit_en and emit_enb) to transmit the output stored in thebit-store 180. It is noted that CNT_b[X] may correspond to an inverse ofthe CNT[X] and emit_enb corresponds to an inverse of emit_en.

It should be appreciated that in some embodiments the counter 130 maydecrement, a comparator 170 may output a logical low value if every bitmatches, or any combination thereof. In other words, a variety of validembodiments may apply described memory-in-pixel techniques. Furthermore,an optional transistor 182 may be included in the portion 168 of thesub-pixel 72 to provide power-saving benefits from precharging a commonoutput (e.g., MTCH) node of the comparator 170. It should also be notedthat in some embodiments, the counting circuitry 130 may be located inthe row driver 60, or any suitable component, such that outputs from thecounter 130 are transmitted to the sub-pixels 72.

As described above, the memory circuitry of the sub-pixel 72 operates toprovide a pulse width emission scheme and permits light emissionaccording to a gray level represented by the bits stored in thebit-stores 178. In the event that a bit-store 178 were to be defectiveafter manufacturing, there may be no easy or convenient way to repairthe individual bit-store 178 (e.g., direct replace the bit-store 178),hence why rerouting techniques are so desirable.

To help illustrate these rerouting techniques, FIGS. 8A-8C, FIGS.10A-10C, and FIGS. 12A-12C each depict a diagrammatic representation ofan example 8-bit memory having eight bit-stores 178. FIGS. 8A-8C depicthow data transmitted to a defective bit-store 178 may be rerouted to aspare bit-store 178. FIGS. 10A-10C depict how data transmitted to adefective bit-store 178 may be rerouted to a bit-store 178 correspondingto a least significant bit (e.g., bit 0). In addition, FIGS. 12A-12Cdepict how two bits of data transmitted to defective bit-storesdefective bit-store 178 may be rerouted to a spare bit-store 178 andrerouted to a bit-store 178 corresponding to a least significant bit.These various sequences of figures show the flexibility in applying thererouting techniques to the sub-pixel 72.

As described above, FIG. 8A is a diagrammatic representation of a firstembodiment of the memory circuitry 172, memory circuitry 172A, includinga spare bit-store 178S and additional bit-stores 178A-178H for storingthe eight bits of image data transmitted to a sub-pixel 72. Thebit-store 178A corresponds to a least significant bit (LSB) of thetransmitted image data while the bit-store 178H corresponds to a mostsignificant bit (MSB) of the transmitted image data. The spare bit-store178S may be included in the memory circuitry 172 as a dedicated sparebit-store to be used in the event that a bit-store 178A-178H is found tobe defective but is unused when each of the memory components of thememory circuitry 172A are operational. Thus, a spare bit-store 178S isindependent of bit position associations corresponding to other memorycomponents in the memory circuitry 172A because any data for anybit-store may be routed instead to the spare bit-store 178S.

FIG. 8B is a diagrammatic representation of the memory circuitry 172Ahaving a defective bit-store 178H. In the event that a bit-store 178H isfound to be defective, mapping may be used to reroute the bit to betransmitted to the defective bit-store 178H from the defective bit-store178H to the spare bit-store 178S.

To illustrate the effect of the rerouting, FIG. 8C is a diagrammaticrepresentation of the memory circuitry 172A implementing reroutingtechniques to reroute data from the defective bit-store 178H to thespare bit-store 178S. In some embodiments, the most significant bit tobe transmitted to the defective bit-store 178H is rerouted to be storedin the spare bit-store 178S. This rerouting may occur while maintain therouting for the other bits to the original bit-stores, such thatbit-store 178A continues to receive the least significant bit (e.g., bit0), bit-store 178B receives the second least significant bit (e.g., bit1), and the like. After rerouting the bit to the spare bit-store 178S,the defective bit-store 178H becomes unused and is not routed to a bitassociated with the image data. It should be understood that while thememory circuitry 172A is depicted as including eight bit-stores 178 andone unassigned spare bit-store 178S, any suitable number of bit-storesand any suitable number of spare bit-stores may be included in thememory circuitry 172 to provide the benefits of this disclosure.

To help illustrate the rerouting operations described herein, FIG. 9 isa block diagram of a memory-in-pixel display system 52 that implementsthe memory circuitry 172A including the bit-stores 178A-H and the sparebit-store 178S. As depicted, the bit-store 178G is defective. Inresponse to determining the bit-store 178G is defective, the timingcontroller 54 may operate to replace the defective bit-store 178G withthe spare bit-store 178S by setting the counter 130 output for thedefective bit-store 178B to zero (e.g., CNT[X]=0 and CNT_b[X]=0),effectively disabling the defective bit-store 178G. The counter 130output for the defective bit-store 178G is disabled in addition to thedata lines corresponding to the defective bit-store 178G. This disablingmay also help to reduce power consumption of the display system 52 sincethe unused bit-store 178G is no longer consuming power or consumingnegligible amounts of power. The redundancy control circuitry 200 mayinclude memory and logic components to facilitate the row driver 60 andcolumn driver 62 with managing the operational logic of the image datarouting. In this way, the timing controller 54 may arbitrate routing orrerouting of image data from the defective bit-store 178G to the sparebit-store 178S via multiplexer 202S. The timing controller may alsooperate the row driver 60 to reroute the counter 130 output (CNT[X])from the bit-store 178G to the spare bit-store 178S via the multiplexer204S. The redundancy control circuitry 200 may selectively control themultiplexers 202 and the multiplexers 204. The row driver 60 and columndriver 62 may operate and/or reroute bits based on control signals fromthe timing controller 54. Through communication with the redundancycontrol circuitry 200, the row driver 60, and the column driver 62, thetiming controller 54 may reroute the defective bit-store 178G with thespare bit-store 178S based on a map of the defective bit-stores 178 ofthe display system 52. In some embodiments, the timing controller 54 mayoperate to replace additional defective bit-stores 178 with additionalincluded spare bit-stores 178. The timing controller 54 may cause atleast in part the output image data from the bit-stores 178 to driver 80that uses internal digital logic and analog driving circuitry associatedwith the sub-pixel 72 to emit light from the LED 103 to facilitatepresent the image.

FIG. 10A is a diagrammatic representation of a second embodiment of thememory circuitry 172, memory circuitry 172B, that includes bit-stores178A-178H used to store the eight bits of image data transmitted to asub-pixel 72. The bit-store 178A corresponds to a least significant bit(LSB) of the transmitted image data while the bit-store 178H correspondsto a most significant bit (MSB) of the transmitted image data. Thememory circuitry 172B does not include a spare bit-store 178S, and inthis way, in the event that a bit-store 178A-178H is found to bedefective, the bit for the defective bit store 178 is rerouted to thebit-store 178 corresponding to the least significant bit, in thisexample, bit-store 178A. This particular rerouting is useful since itdoes not introduce additional circuitry into the memory circuitry 172and may correct defective bit-stores 178 in a similar manner as thespare bit-store 178S rerouting technique. To elaborate on the concept,the least significant bit may provide a smaller contribution to theoverall light emitted from the sub-pixel 72 and thus may be replaced bya more significant bit that causes a larger contribution to the overalllight emitted. For example, a first eight bit binary number “10011111”corresponds to a gray level of 159, while the binary number “10011110”corresponds to a gray level of 158 (created by changing the state of theleast significant bit) and the binary number “00011111” corresponds to agray level of 31 (created by changing the state of the most significantbit) showing that using the bit-store 178A corresponding to the leastsignificant bit to replace a defective bit-store 178H corresponding tothe most significant bit has less impact to the overall gray level thanpermitting the most significant bit to be unused in the final gray levelused for light emission.

To help illustrate FIG. 10B is a diagrammatic representation of thememory circuitry 172B that include a defective bit-store 178H. In theevent that a bit-store 178H is found to be defective (e.g., discoveredafter manufacturing but before shipment to a customer), mapping may beused to reroute the bit to be transmitted to the defective bit-store178H from the defective bit-store 178H to the bit-store 178Acorresponding to the least significant bit of the transmitted imagedata.

FIG. 10C is a diagrammatic representation of the memory circuitry 172Bimplementing rerouting techniques to reroute data from the defectivebit-store 178H to the bit-store 178A for the least significant bit(e.g., bit 0). As is illustrated, the most significant bit (e.g., bit 7)to be transmitted to the defective bit-store 178H is rerouted to bestored in the bit-store 178A. This rerouting may occur while keeping theother bits routed (e.g., mapped) to the original bit-stores, such thatbit-store 178B continues to receive the second least significant bit,bit-store 178C continues to receive the third bit, and the like. Afterrerouting the bit to the bit-store 178A, the defective bit-store 178H isrerouted the least significant bit (e.g., bit 0) instead of the mostsignificant bit (e.g., bit 7). It should be understood that while thememory circuitry 172B is depicted as including eight bit-stores, anynumber of bit-stores may be included and any number of reroutings may beused in the memory circuitry 172 to provide the benefits of thisdisclosure.

To further illustrate, FIG. 11 is a block diagram of a memory-in-pixeldisplay system 52 that implements the memory circuitry 172B includingthe bit-stores 178A-H. As depicted, the bit-store 178C is defective. Inresponse to determining the bit-store 178F is defective, the timingcontroller 54 may arbitrate routing or rerouting of image data from thedefective bit-store 178F to the least significant bit-store 178A viamultiplexer 202A. As described above, the redundancy control circuitry200 may include memory and logic components to facilitate the row driver60 and column driver 62 with managing the operational logic of the imagedata routing, for example, by operating one or more of the multiplexers202 and/or the multiplexers 204. In this way, the bit originallycorresponding to the defective bit-store 178F is permitted to affectlight emission while the least significant bit data originallycorresponding to the bit-store 178A is not permitted to affect lightemission (e.g., through being rerouted to a defective bit-store 178F).

To perform this LSB rerouting, the redundancy control circuitry 200 mayselectively control the multiplexers 202 and the multiplexers 204. Therow driver 60 and column driver 62 may reroute signals based on controlsignals received from the timing controller 54. Through communicationwith the redundancy control circuitry 200, the row driver 60, and thecolumn driver 62, the timing controller 54 may reroute data for thedefective bit-store 178F to the bit-store 178A based at least in part ona map of defective bit-stores 178 associated with the display system 52.In some embodiments, the timing controller 54 may operate to reroutebits corresponding to additional defective bit-stores 178 to otherbit-stores 178 not already being used from rerouting. Thus, a timingcontroller 54 may perform the rerouting two, three, four, or more timesbased on the particular display system 52 embodiment. The timingcontroller 54 may operate the sub-pixel 72 to transmit the bits storedin the bit-stores 178 to the driver 80 to cause light emission from theLED 103 corresponding to an image to be displayed.

In some embodiments, spare bit-stores 178 and LSB rerouting techniquesmay be combined. To help illustrate, FIG. 12A is a diagrammaticrepresentation of a third embodiment of the memory circuitry 172, memorycircuitry 172C, that uses both a spare bit-store 178S and LSB reroutingtechniques to correct for defective bit-stores 178. The memory circuitry172C includes bit-stores 178A-178H used to store the eight bits of imagedata transmitted to a sub-pixel 72 and a spare bit-store 178S. Thebit-store 178A corresponds to a least significant bit (LSB) of thetransmitted image data while the bit-store 178H corresponds to a mostsignificant bit (MSB) of the transmitted image data. In this embodiment,the most impactful defective bit-store 178H (e.g., the most significantbit position) on the gray level is replaced by the spare bit-store 178Sand the bit corresponding to the second most impactful defectivebit-store 178C is rerouted a bit-store 178A that corresponds to theleast significant bit (or lesser significant bit). If additionaldefective bit-stores 178 exist, the LSB rerouting may be repeated toreroute each impactful bit into functional non-defective bit-stores 178.Through following this combined technique, perceivable impacts ondisplayed image quality caused by two or more defective bit-stores areminimized and/or eliminated.

FIG. 12B is a diagrammatic representation of the memory circuitry 174Chaving a first defective bit-store 178H and a second defective bit-store178C. In the event that multiple bit-stores 178 are defective (e.g.,discovered after manufacturing but before shipment to a customer),mapping may be used to reroute the bits to be transmitted to thedefective bit-stores 178 from the defective bit-stores 178 to thebit-store 178A corresponding to the least significant bit of thetransmitted image data and/or to a spare bit-store 178S. In thisembodiment, one spare bit-store 178S is included, however, in someembodiments, multiple spare bit-stores 178S may be included. Inaddition, in this embodiment, one LSB rerouting is performed, however,as described above, multiple LSB reroutings may be performed—that is, afirst and a second least significant bit may be used to correct fordefective bit-stores 178C and 178H.

FIG. 12C is a diagrammatic representation of the memory circuitry 172Cimplementing rerouting techniques to reroute data for the firstdefective bit-store 178H to the spare bit-store 178S and to reroute datafor the second defective bit-store 178C to the bit-store 178Acorresponding to a least significant bit. This rerouting may occur whilekeeping the other bits routed to the original bit-stores 178, such thatbit-store 178B continues to receive the second least significant bit,bit-store 178D continues to receive the fourth bit, and the like. Afterrerouting the first bit to the spare bit-store 178S and the second bitto the bit-store 178A, the defective bit-store 178H becomes unused andis not routed image data for display while the defective bit-store 178Cis routed image data originally routed to the bit-store 178A. It shouldbe understood that while the memory circuitry 172B is depicted asincluding eight bit-stores 178A-178H to store image data and a sparebit-store 178S, any number of bit-stores 178 may be included to providethe benefits of this disclosure.

With the foregoing in mind, FIG. 13 is a flow chart for a method 220 forgenerating a map of defective bit-stores 178 for a memory-in-pixelelectronic display. Although the following description of the method 220is described as being performed by the timing controller 54, it shouldbe understood that any suitable processing-type device may perform themethod 220. Also, it should be understood that the method 220 may not belimited to being performed accordingly to the order depicted in FIG. 13;and instead may be performed in any suitable order.

Referring now to FIG. 13, at block 222, the timing controller 54 mayreceive test data. The test data may be used to facilitate anidentification of memory components (e.g., bit-stores 178) that aredefective. In this way, the test data may act as a control to compare(e.g., determine a difference between) measured performance ofsub-pixels 72 to determine if the respective bit-stores 178 for theparticular sub-pixels 72 are correctly operating.

After receiving the test data, at block 224, the timing controller 54may load the memory circuitry 172 with the test data. To do this, thetiming controller 54 may operate the column driver 62 to individuallystore bits corresponding to a gray level for the test data into eachbit-store 178 such that the corresponding digital number represented bythe bit-store 178 equals the gray level of the test data. The columndriver 62 may operate each bit-store 178 to receive the test data bitthrough selective activation of the corresponding transistors 176.

If the light emitted by the sub-pixel 72 deviates from what the expectedperceived gray level (e.g., known gray level transmitted as the testdata), the timing controller 54 may correlate the deviation to one ormore defective bit-stores 178. Thus, at block 228, the timing controller54 may determine where memory of the display system 52 is defectivethrough performing electrical or optical testing on the output generatedin response to the test data. The timing controller 54 may determine thedefective bit-stores 178 in a variety of ways including, but not limitedto, receiving an indication from a user input defining which bit-stores178 are defective, from measuring a quality or brightness of lightemitted by the display system 52 while displaying the test data anddetermining the measured value deviates from an expected valueassociated with the test data (such as through optical testing involvingone or more optical measurements, or optical-based measurements),performing electrical testing to determine which bit-stores 178 aredefective, or the like.

Based on the defective bit-stores 178, at block 230, the timingcontroller 54 may generate a map indicative of the defective bit-stores178 and subsequent reroutings to decrease or eliminate the impact of thedefective bit-stores 178. In some embodiments, the timing controller 54may work with additional processing circuitry, such as the processingcore complex 12, to generate the map. This map may be interpretable bythe row driver 60, the timing controller 54, the redundancy controlcircuitry 200, and/or the column driver 62 to facilitate in thererouting and correction of the defective bit-stores 178.

To help describe how the map is used in displaying image data, FIG. 14is a flow chart for a method 250 for displaying an image via thememory-in-pixel electronic display system 52 according to the map.Although the following description of the method 250 is described asbeing performed by the timing controller 54, it should be understoodthat any suitable processing-type device may perform the method 250.Also, it should be understood that the method 250 may not be limited tobeing performed accordingly to the order depicted in FIG. 14; andinstead may be performed in any suitable order.

Referring now to FIG. 14, at block 252, the timing controller 54 mayreceive the map. As described above, the map may be externally generatedby the processing core complex 12, or otherwise transmitted to thetiming controller 54. In addition, the timing controller 54 may accessthe map from a memory location, such as a storage device 14.

After receiving the map, at block 254, the timing controller 54 mayreceive the image data. The timing controller 54 may receive the imagedata from a variety of sources, including processing circuitry dedicatedto retrieving, preparing, and transmitting of individual frames of imagedata for display. In addition, the timing controller 54 may operate toretrieve the image data itself from a suitable memory location, such asa storage device 14.

After the timing controller 54 receives the image data, at block 256,the timing controller 54 may load the memory circuitry 172 with theimage data according to the map. That is, the timing controller 54 mayread the map to receive the reroutings that are to occur to correct fordefective bit-stores 178. Based on reading the map, the timingcontroller 54 loads the bit-stores 178 according to the mappings thatreroute defective bit-stores to mapped bit-stores with the correct imagedata. In this way, the defective bit-stores 178 are unused (theexception being when a least significant bit is rerouted intentionallyinto a defective bit-store 178) and the spare bit-stores 178 areleveraged to lessen the impact one or more defective bit-store 178 hason perceived image quality and perceived gray levels.

The timing controller 54, at block 258, may operate to present the imagedata according to the loaded memory circuitry 172, after loading thevarious bit-stores 178 according to the map. As described above, thetiming controller 54 operates to present an image through operating thesub-pixel 72 to emit light for a particular duration of timecorresponding to the image data loaded into the bit-stores 178 of thatsub-pixel 72. Thus, through loading the memory circuitry 172 accordingto the map indicative of the defective bit-stores 178 and rerouting datato reduce the impact of the defective bit-stores 178, the timingcontroller 54 is able to continue to operate a display system 52 evenwhile the display system 52 has defective memory in one or moresub-pixels 72.

In some embodiments, these techniques are applied over groups of pixels,such as over one or more rows of pixels. For example, instead of eachsub-pixel having a dedicated spare bit-store 178S, four rows of pixelsmight share one or more of the bit-stores 178. In these embodiments, thedisplay system 52 may support differing data handling schemes, whereimage data is loaded for emission at different times, permitting thesharing of the bit-stores 178.

In addition, in some embodiments, in generation of the map, the timingcontroller 54 or other suitable processing circuitry may take intoconsideration secondary factors to determine which defective bit-store178 to replace with the spare bit-store 178. For example, the timingcontroller 54 may determine a location of the pixel on the screen orwhich sub-pixel the particular defective bit-store 178 is affecting toprioritize the repair. In this way, a defective bit-store 178 thataffects a pixel in the middle of a screen may have replacementprioritized over a defective bit-store 178 that affects a pixel on theside of a screen. As another example, certain channels of sub-pixels 72may be prioritized, such as repairs to affected red sub-pixels 72 may beprioritized over blue sub-pixels 72.

Thus, the technical effects of the present disclosure includeimprovements to controllers of electronic displays to compensate fornon-uniform pixel properties caused by defective memory of amemory-in-pixel display system, for example, through generating a mapcorresponding to defective memories that shows reroutings from thedefective memory to different memory to compensate for the defectivememories. These techniques describe rerouting data from defectivebit-stores to functional, non-defective bit-stores based on howsignificant of a bit the defective bit-store is associated with. Thesetechniques describe an improved manner to detect and correct defectivebit-stores, enabling the continued use of a memory-in-pixel displaysystem even when defective bit-stores are included in memory circuitry.In addition, memory-in-pixel electronic displays may implement memorycells distributed across pixels of the electronic displays where it maynot be feasible or possible to use standard redundancy schemes.

The specific embodiments described above have been shown by way ofexample, and it should be understood that these embodiments may besusceptible to various modifications and alternative forms. It should befurther understood that the claims are not intended to be limited to theparticular forms disclosed, but rather to cover all modifications,equivalents, and alternatives falling within the spirit and scope ofthis disclosure.

The techniques presented and claimed herein are referenced and appliedto material objects and concrete examples of a practical nature thatdemonstrably improve the present technical field and, as such, are notabstract, intangible or purely theoretical. Further, if any claimsappended to the end of this specification contain one or more elementsdesignated as “means for [perform]ing [a function] . . . ” or “step for[perform]ing [a function] . . . ”, it is intended that such elements areto be interpreted under 35 U.S.C. 112(f). However, for any claimscontaining elements designated in any other manner, it is intended thatsuch elements are not to be interpreted under 35 U.S.C. 112(f).

What is claimed is:
 1. An electronic display comprising: a memorystorage configured to store a data value representative of image data tobe depicted via a pixel circuit, wherein the memory storage comprises aplurality of memory components configured to store a plurality of bitsof the data value, and wherein the memory storage is disposed within apixel array of the electronic display; a light-emitting deviceconfigured to emit light based at least in part on the data value; and acontroller configured to: receive the data value; store the plurality ofbits in the plurality of memory components based at least in part on amapping between the plurality of bits and the plurality of memorycomponents, wherein the mapping is determined based on routing one ormore of the plurality of bits associated with one or more defectivememory components of the plurality of memory components to one or moreother memory components of the plurality of memory components; and drivethe light-emitting device to emit light based at least in part on theplurality of bits stored in the plurality of memory components inaccordance with the mapping.
 2. The electronic display of claim 1,wherein the one or more other memory components are associated with alesser significant bit than the one or more of the plurality of bits. 3.The electronic display of claim 1, wherein the one or more other memorycomponents correspond to spare memory components.
 4. The electronicdisplay of claim 1, wherein the pixel circuit comprises a comparatorconfigured to compare the data value to a sequence of bits generated bya counter, and wherein the controller is configured to transmit anoutput from the comparator to facilitate light emission in response tothe comparator determining that the data value matches the sequence ofbits.
 5. The electronic display of claim 1, wherein the controller isconfigured to drive the light-emitting device at least in part by:retrieving the plurality of bits from the plurality of memory componentsin accordance with the mapping; and emitting the light for a period oftime that corresponds to the data value represented by the plurality ofbits in accordance with the mapping.
 6. The electronic display of claim1, comprising an additional pixel circuit, wherein the controller isconfigured to transmit of the data value to the pixel circuit and theadditional pixel circuit via one or more multiplexers.
 7. The electronicdisplay of claim 1, wherein each memory component of the plurality ofmemory components is configured to store one bit of data.
 8. Theelectronic display of claim 1, wherein the mapping is determined basedon a test data value received by the controller and an electricalmeasurement or optical measurement made in response to the test datavalue.
 9. The electronic display of claim 1, wherein the mapping isconfigured to route a first bit associated with a first one of the oneor more defective memory components to one of the one or more othermemory components that corresponds to a least significant bit of thedata value.
 10. The electronic display of claim 1, wherein the mappingis configured to route a first bit associated with a first one of theone or more defective memory components to one of the one or more othermemory components that corresponds to a spare memory component of theplurality of memory components, and wherein the spare memory componentis unused when each of the plurality of memory components isoperational.
 11. A method, comprising: receiving, via a pixel circuitdisposed in a pixel array of an electronic display, a data value;storing, via the pixel circuit, a plurality of bits in a plurality ofmemory components associated with the pixel circuit based at least inpart on a mapping between the plurality of bits and the plurality ofmemory components, wherein the plurality of memory components isdisposed within the pixel array of the electronic display, and whereinthe mapping is determined based on routing one or more of the pluralityof bits associated with one or more defective memory components of theplurality of memory components to one or more other memory components ofthe plurality of memory components; and driving, via the pixel circuit,a light-emitting device to emit light based at least in part on theplurality of bits stored in the plurality of memory components inaccordance with the mapping.
 12. The method of claim 11, comprisingrouting a first bit associated with a first one of the one or moredefective memory components to one of the one or more other memorycomponents corresponding to a least significant bit of the data value.13. The method of claim 11, comprising routing a first bit associatedwith a first one of the one or more defective memory components to oneof the one or more other memory components that corresponds to a sparememory component of the plurality of memory components, wherein thespare memory component is unused when each of the plurality of memorycomponents is operational.
 14. The method of claim 11, comprising:retrieving the plurality of bits from the plurality of memory componentsin accordance with the mapping; and emitting the light for a period oftime that correspond to the data value represented by the plurality ofbits in accordance with the mapping.
 15. The method of claim 11, whereinthe mapping based at least in part on a difference between an imagedepicted by an electronic display in response to test data values and anexpected image to be depicted by the electronic display in response tothe test data values.
 16. A pixel circuit, comprising: a memory storageconfigured to store a data value representative of image data to be usedto cause light emission, wherein the memory storage comprises aplurality of memory components configured to store a plurality of bitsof the data value, and wherein the memory storage is disposed within apixel array of an electronic display; and a light-emitting deviceconfigured to emit light based at least in part on the data value,wherein the light-emitting device is configured to emit light based atleast in part on a transmission of one or more control signals to thememory storage that cause each respective bit of the plurality of bitsto be output from each respective memory component of the plurality ofmemory components in accordance with a time-multiplexed schemedetermined based on a mapping, wherein the output of the plurality ofbits corresponds to a driving signal provided to the light-emittingdevice to cause emission of the light, and wherein the mapping comprisesone or more associations of one or more of the plurality of bitsassociated with one or more defective memory components of the pluralityof memory components to one or more other memory components of theplurality of memory components.
 17. The pixel circuit of claim 16,wherein one of the one or more other memory components of the pluralityof memory components corresponds to at least a least significant bit ofthe data value.
 18. The pixel circuit of claim 16, wherein the one ormore other memory components correspond to one or more spare memorycomponents.
 19. The pixel circuit of claim 16, wherein the mappingassociates a first bit that corresponds to a first one of the one ormore defective memory components with one of the one or more othermemory components that corresponds to a least significant bit of thedata value.
 20. The pixel circuit of claim 16, wherein the mappingassociates a first bit that corresponds to a first one of the one ormore defective memory components with one of the one or more othermemory components that corresponds to a spare memory component of theplurality of memory components, and wherein the spare memory componentis independent of bit position associations corresponding to theplurality of memory components is operational.